I would like to propose that we apply Agile development methods as
much as we can.

it depends what you mean with agile.

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IMHO forget Scrum as we are not the community to get a commitment for
this.

Why? What does our community do not like about scrum?
We do not like the Values of scrum?
Focus
Openess
Respect
Commitment
Courage
Or maybe we do not like the pillars?
Transparency, Inspect and adapt?
;)

Agreed, I think we can not use SCRUM in the same way Companies do, too.
But I think we can use the Idea of scrum to work together and to
simplify our work. What would you use to make our work simple?
Why do you think Ordering our Bugs in a List and add details to them
will not bring us forward?

Kanban would be nice.

YAY!
I take this as a success!! :-D
One step forward. Thousands more to go.

So where you would establish the board? - Use trello? Confluence?
(Nooooo.... ;) )
Jira has a Backlog and a Kanban board integrated which I am told are
very easy to use (Drag & drop I hope...)

At the end it's a bit problematic for us with the attributes of
volunteers, their unpredictable working time (time to work on
OpenOffice tasks) and the number of volunteers.

However, we should try to keep it simple as Product Backlop, Product
Owner, Tasks, Sub-Tasks, Jira, Confluence etc. would be much too much
complexity for us when doing/using all of them.

Maybe I have learned a total different scrum then you did? - Agile does
not mean to use everything like a fixed ruleset. To me SCRUM is a
template to start with It just tells us what prooved to be working well.
But How and what we can use from the framework, is up to us.

Again. Only Product Backlog, Product Owner, and a Kanban board are on
the table as to be used. And I do only want the Product owner so we have
some steward for the list. I am totaly fine with a Release Manager
looking into it.
I have not explained to maximize Value and Output, since I do not
believe we do need to maximize Value and Output, since we are Open
Source Volunteering Community and not OpenSource Commercial Product.
Small but important difference not to forget. (If we get OpenSource
Comercial part, we have to make sure they can spend their energy on
maximizing Value. ;) )